THE SYNTHESIS OF THE PROTEINS 53 



split open between the leucine and the glycine. With trypsin 1-leucyl- 

 glycine was first formed and d-alanine split off. We have thus a differ- 

 ence in the point of attack of enzymes of different origin, and may 

 therefore possess a sharp means of differentiating between the various 

 proteoclastic enzymes ; it may prove of use in determining the nature 

 of a complex polypeptide resulting by the hydrolysis of protein. 



